board/BuR/brxre1: drop obsolete CONFIG_LCD_NOSTDOUT from config-header

This define isn't used anymore in the u-boot source tree, so we drop it
from the config header.

We drop it also from the 'config_whitelist.txt'

Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
Reviewed-by: Tom Rini <trini@konsulko.com>